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Tunable transmission of quantum Hall edge channels with full degeneracy lifting in split-gated graphene devices

Author

Listed:
  • Katrin Zimmermann

    (Univ. Grenoble Alpes, Institut Néel
    CNRS, Institut Néel)

  • Anna Jordan

    (Univ. Grenoble Alpes, Institut Néel
    CNRS, Institut Néel)

  • Frédéric Gay

    (Univ. Grenoble Alpes, Institut Néel
    CNRS, Institut Néel)

  • Kenji Watanabe

    (Advanced Materials Laboratory, National, Institute for Materials Science)

  • Takashi Taniguchi

    (Advanced Materials Laboratory, National, Institute for Materials Science)

  • Zheng Han

    (Univ. Grenoble Alpes, Institut Néel
    CNRS, Institut Néel)

  • Vincent Bouchiat

    (Univ. Grenoble Alpes, Institut Néel
    CNRS, Institut Néel)

  • Hermann Sellier

    (Univ. Grenoble Alpes, Institut Néel
    CNRS, Institut Néel)

  • Benjamin Sacépé

    (Univ. Grenoble Alpes, Institut Néel
    CNRS, Institut Néel)

Abstract

Charge carriers in the quantum Hall regime propagate via one-dimensional conducting channels that form along the edges of a two-dimensional electron gas. Controlling their transmission through a gate-tunable constriction, also called quantum point contact, is fundamental for many coherent transport experiments. However, in graphene, tailoring a constriction with electrostatic gates remains challenging due to the formation of p–n junctions below gate electrodes along which electron and hole edge channels co-propagate and mix, short circuiting the constriction. Here we show that this electron–hole mixing is drastically reduced in high-mobility graphene van der Waals heterostructures thanks to the full degeneracy lifting of the Landau levels, enabling quantum point contact operation with full channel pinch-off. We demonstrate gate-tunable selective transmission of integer and fractional quantum Hall edge channels through the quantum point contact. This gate control of edge channels opens the door to quantum Hall interferometry and electron quantum optics experiments in the integer and fractional quantum Hall regimes of graphene.

Suggested Citation

  • Katrin Zimmermann & Anna Jordan & Frédéric Gay & Kenji Watanabe & Takashi Taniguchi & Zheng Han & Vincent Bouchiat & Hermann Sellier & Benjamin Sacépé, 2017. "Tunable transmission of quantum Hall edge channels with full degeneracy lifting in split-gated graphene devices," Nature Communications, Nature, vol. 8(1), pages 1-7, April.
  • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14983
    DOI: 10.1038/ncomms14983
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    Cited by:

    1. Thomas Werkmeister & James R. Ehrets & Yuval Ronen & Marie E. Wesson & Danial Najafabadi & Zezhu Wei & Kenji Watanabe & Takashi Taniguchi & D. E. Feldman & Bertrand I. Halperin & Amir Yacoby & Philip , 2024. "Strongly coupled edge states in a graphene quantum Hall interferometer," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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